Low-voltage electrical testing electric pen is a commonly used helping the security apparatus. 500V for the following investigation of various electrical conductor or housing facilities are charged. Experience a normal low-voltage electric pens, comes with, as long as the master principle of testing electric pen, well aware of the electrical bonding principles, flexibility in the use of many techniques.
AC neon tubes covered with bright, neon light end of the DC.
First, tell the reader a little bit, before the use of low-voltage electric pen test, be sure to clearly recognize the experience of charged test body; not explicitly recognized in the normal inspection before the electric pen, can not use. Identify AC, DC, the best in the "two power" comparison between, so very superficial. AC test both ends when the neon lights, neon tube when measuring DC, only one end of a very shiny.
Cathode front-end is bright, bright as a positive back-end.
Neon power front-end refers to the inspection head end of the pen, holding a neon tube means the end of the back-end, front bright as the cathode, as opposed to positive. Testing to the attention of: power supply 110V and above; if people and the earth insulation, a hand touching the power of any one pole, the other people holding test pen, metal pen first touched the electric power to the test another pole, neon front very bright, touch the power supply is measured by the cathode; back if it is a very bright neon tubes, the measured power is positive touch, which is based on the current one-way flow and positive flow of electrons from the cathode to the principle.